/****************************************************************************
 * arch/rgmp/src/rgmp.c
 *
 *   Copyright (C) 2011 Yu Qiang. All rights reserved.
 *   Author: Yu Qiang <yuq825@gmail.com>
 *
 * This file is a part of NuttX:
 *
 *   Copyright (C) 2011 Gregory Nutt. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

#include <rgmp/trap.h>
#include <rgmp/rtos.h>
#include <rgmp/arch/arch.h>

#include <nuttx/config.h>
#include <nuttx/init.h>
#include <nuttx/arch.h>
#include <nuttx/sched.h>
#include <nuttx/kmalloc.h>
#include <nuttx/clock.h>

#include <semaphore.h>
#include <queue.h>
#include <stdlib.h>
#include <arch/arch.h>
#include <sched/sched.h>

int nest_irq = 0;

// The default time is 10ms
// REVISIT: tick time is given by CONFIG_USEC_PER_TICK.  MSEC_PER_TICK may
// be zero.

#ifdef MSEC_PER_TICK
const unsigned int rtos_tick_time = MSEC_PER_TICK;
#else
const unsigned int rtos_tick_time = 10;
#endif

void rtos_entry(void)
{
  os_start();
}

void *rtos_get_page(void)
{
  return memalign(PTMEMSIZE, PTMEMSIZE);
}

void rtos_free_page(void *page)
{
  free(page);
}

void *rtos_kmalloc(int size)
{
  return kmm_malloc(size);
}

void rtos_kfree(void *addr)
{
  kmm_free(addr);
}

/* The interrupt can be nested. The pair of rtos_enter_interrupt()
 * and rtos_exit_interrupt() make sure the context switch is
 * performed only in the last IRQ exit.
 */

void rtos_enter_interrupt(void)
{
  nest_irq++;
}

void rtos_exit_interrupt(void)
{
  local_irq_disable();
  nest_irq--;
  if (!nest_irq)
    {
      struct tcb_s *rtcb = current_task;
      struct tcb_s *ntcb;

      if (rtcb->xcp.sigdeliver)
        {
          rtcb->xcp.ctx.tf = g_current_regs;
          push_xcptcontext(&rtcb->xcp);
        }

      ntcb = this_task();

      /* Switch needed */

      if (rtcb != ntcb)
        {
          rtcb->xcp.ctx.tf = g_current_regs;
          current_task = ntcb;
          rgmp_switch_to(&ntcb->xcp.ctx);
        }
    }
}

void rtos_timer_isr(void *data)
{
  sched_process_timer();
}

/* RTOS semaphore operation */

int rtos_sem_init(struct semaphore *sem, int val)
{
  if ((sem->sem = kmm_malloc(sizeof(sem_t))) == NULL)
    return -1;
  return sem_init(sem->sem, 0, val);
}

int rtos_sem_up(struct semaphore *sem)
{
  return sem_post(sem->sem);
}

int rtos_sem_down(struct semaphore *sem)
{
  return sem_wait(sem->sem);
}

void rtos_stop_running(void)
{
  extern void nuttx_arch_exit(void);

  local_irq_disable();

  nuttx_arch_exit();

  while (1)
    {
      arch_hlt();
    }
}

int rtos_vnet_init(struct rgmp_vnet *vnet)
{
  extern int vnet_init(struct rgmp_vnet *vnet);

  return vnet_init(vnet);
}
